/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.jstorm.hdfs.bolt.format;
import backtype.storm.task.TopologyContext;
import java.util.Map;
/**
* Creates file names with the following format:
* <pre>
* {prefix}{componentId}-{taskId}-{rotationNum}-{timestamp}{extension}
* </pre>
* For example:
* <pre>
* MyBolt-5-7-1390579837830.txt
* </pre>
*
* By default, prefix is empty and extenstion is ".txt".
*
*/
public class DefaultFileNameFormat implements FileNameFormat {
private String componentId;
private int taskId;
private String path = "/storm";
private String prefix = "";
private String extension = ".txt";
/**
* Overrides the default prefix.
*
* @param prefix
* @return
*/
public DefaultFileNameFormat withPrefix(String prefix){
this.prefix = prefix;
return this;
}
/**
* Overrides the default file extension.
*
* @param extension
* @return
*/
public DefaultFileNameFormat withExtension(String extension){
this.extension = extension;
return this;
}
public DefaultFileNameFormat withPath(String path){
this.path = path;
return this;
}
public void prepare(Map conf, TopologyContext topologyContext) {
this.componentId = topologyContext.getThisComponentId();
this.taskId = topologyContext.getThisTaskId();
}
@Override
public String getName(long rotation, long timeStamp) {
return this.prefix + this.componentId + "-" + this.taskId + "-" + rotation + "-" + timeStamp + this.extension;
}
public String getPath(){
return this.path;
}
}